Get holder information for a given ticker symbol.
AI agents call get_holder_info to retrieve information from Yahoo Finance MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves publicly available holder information (ownership data, institutional investors, etc.) for a stock ticker. It performs a read-only query with no side effects, does not modify or delete data, and does not trigger financial transactions or execute arbitrary code.
From the tool's definition Tool name 'get_holder_info' and description 'Get holder information for a given ticker symbol' indicate a data retrieval operation with no modification, deletion, or execution of external operations.
Attacks that exploit this kind of access
Get holder information for a given ticker symbol. It is categorised as a Read tool in the Yahoo Finance MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Yahoo Finance MCP Server MCP server in PolicyLayer and add a rule for get_holder_info: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Yahoo Finance MCP Server. Nothing to install.
get_holder_info is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the get_holder_info rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for get_holder_info. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
get_holder_info is provided by the Yahoo Finance MCP Server MCP server (leo-ye0/mcp-finance-data). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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